盘龙铅锌矿浮选铅中矿工艺矿物学特征研究

针对广西盘龙铅锌矿选矿厂铅浮选指标较差的现状,以现场产出的铅中矿1为研究对象,采用化学多元素分析、物相分析、光学显微镜鉴定、解离度统计等技术手段,对盘龙铅锌矿浮选铅中矿的化学组成、物相组成、目的矿物的嵌布粒度及嵌布特征进行了详尽的工艺矿物学特征研究。研究结果表明,铅中矿1含Pb 2. 03%,主要赋存于方铅矿中;方铅矿整体嵌布粒径细小,经筛分分级后,不同粒径的分级产品中方铅矿的嵌布特征差异性极大,+74μm及-74～+39μm部分含铅矿物颗粒基本为铅-锌-硫复杂连生的集合体,这两个粒级金属总占有率达56%以上,是影响盘龙铅锌矿铅浮选指标的关键所在。根据以上研究结果,推荐采用对铅中矿1进行分级磨矿工艺流程改造,提高铅中矿1中方铅矿的单体解离度,实现铅精矿中铅金属回收率的进一步提升。

Process mineralogical characteristics of lead flotation middling in the Panlong lead-zinc mine

In this paper, aimed at tackling the poor lead flotation indexes in the Panlong lead-zinc mine in Guangxi, the authors studied in detail the chemical composition, phase composition, target mineral size and distribution characteristics of lead in the Panlong lead-zinc mine by means of chemical multielement analysis, phase analysis, optical microscopy identification and dissociation degree statistics so as to probe into its physical characteristics. The results show that lead middling 1 contains 2.03% Pb, which mainly occurs in galena. At the same time, the overall size of galena is small. After screening and classification, the distribution characteristics of galena in the products of different particle sizes are very different. Some lead-bearing mineral particles of +74 and -74~+39 micron are mainly lead-zinc-sulfur complex conjoined aggregates, and the total occupancy of these two grades of metals is more than 56%. It is the key to constraining the lead flotation indexes of the Panlong lead-zinc mine. According to the above research results, it is recommended to adopt the grading grinding process to improve the dissociation degree of lead monomer in lead middling 1, so as to further improve the recovery rate of lead metal in lead concentrate.